M4E1 Threaded Complete Upper, 11.5" 5.56 Barrel, 10.3" R-ONE M-LOK HG - FDE Cerakote

This complete upper receiver features the same tried-and-true construction and aesthetics as our M4E1 Threaded Upper Receivers, without provisions for a forward assist.The slimline line of handguards have a unique milling profile, designed to maximize grip ergonomics and minimize weight while still providing plenty of real-estate to accommodate any attachment needs the end user may have. Our proprietary ATLAS attachment system is a durable and dependable mounting platform, maintaining a slim profile while still providing the strength and stability customers have grown to love from Aero Precision handguards.

NOTE: This part features a colored anodized finish. These finishes are held to different aesthetic standards than parts finished in black anodizing or Cerakote. For more information on colored anodizing visit our Knowledge Center.

Includes:

• M4E1 Threaded Upper Receiver
• R-ONE Handguard
• 11.5" 5.56x45mm NATO M4 Carbine Barrel
• Low Profile Gas Block and Carbine-Length Gas Tube
• Product comes assembled
• This complete upper does not include BCG or Charging Handle. These products may be selected as add-ons under the Finish Your Build tab
• The muzzle brake that comes with this complete upper receiver is NOT pinned nor welded to this barrel. Per the National Firearms Act, the muzzle brake MUST be pinned and welded to achieve the necessary 16" as defined by the ATF for a rifle build.

M4E1 THREADED UPPER FEATURES:

• Custom enhanced forging that gives the upper receiver a "billet look" while maintaining the structural integrity of a forged part.
• Picatinny profile that blends seamlessly with our Enhanced and ATLAS Series Handguards
• M4 Feedramps
• .250 takedown pin holes

R-ONE HANDGUARD FEATURES:

• Front and rear picatinny rail for optional attachments
• Compatible with low profile gas blocks
• 1.3” Inside diameter
• 1.5” Outside diameter
• Laser engraved T-marks

11.5" 5.56 CARBINE-LENGTH BARREL FEATURES:

• 5.56x45mm NATO
• QPQ Finish
• M4 Profile
• .750" gas block journal
• Carbine-length gas system
• M4 Feed Ramp Extension
• HP and MPI tested
• Standard A2 Flash Hider